What was found
(CAN) AIRCRAFT WAS APPROACHING CRUISING ALTITUDE OF 190 WHEN THE FLIGHT CREW HEARD A CRACK SIMILAR TO ICE SHEDDING FORM THE PROPS. THEY NOTED AT THIS TIME THAT THE CAPTAINS WINDSCREEN HAD SEVERAL CRACKS RUNNING ACROSS IT. THERE WAS NEVER ANY LOSS OF PRESSURIZATION. AT THIS TIME THEY DECLARED AN EMERGENCY, AND INITIATED AN EMERGENCY DECENT AT A REDUCED SPEED. AIRCRAFT RETURNED TO BASE AND SUBSEQUENT LANDING WERE UNEVENTFUL. ONCE SAFELY ON THE GROUND IT WAS NOTED THAT THE CAPTAINS OUTER PLY OF THE WINDSCREEN HAD FRACTURED. MAINTENANCE REPLACED THE WINDOW.